Dino,
You started on November the 9th. It'll be December the 9th (ish) when you do your second WFP cleans that you'll notice the difference.
The first time round, take your time and get it right. Spend at least as much time as you would if you were cleaning with a ladder; maybe more.
Pay particular attention to the top frame and remember, the second time round you've no more scubbing the frames like a lunatic, the glass is easy.
On the second clean, once round the frames, up and down on the glass, a good rinse and off to the next window.
As quick as that.